diff --git a/.gitignore b/.gitignore
index c3d1f09..bea6f63 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,4 +9,5 @@
 !/src/
 !/docs/
 !/assets/
+!/noctalia-plugin/
 !/README.md
diff --git a/nix/checks.ulu.nix b/nix/checks.ulu.nix
index b657943..36c93a4 100644
--- a/nix/checks.ulu.nix
+++ b/nix/checks.ulu.nix
@@ -88,6 +88,33 @@
             }/testBuildFailure.log
             touch $out
           '';
+        # The plugin as packaged: manifest, every entry present, Luau that
+        # compiles, translations that parse; and its logic against stubbed
+        # Noctalia globals.
+        noctalia-plugin =
+          pkgs.runCommand "valw-noctalia-plugin"
+            {
+              nativeBuildInputs = [
+                pkgs.jq
+                pkgs.luau
+              ];
+            }
+            ''
+              dir=${valw}/share/valw/noctalia-plugin
+              grep -qx 'id = "elars/valw"' $dir/plugin.toml
+              test "$(grep -c '^entry = ' $dir/plugin.toml)" -eq 3
+              for entry in $(sed -n 's/^entry = "\(.*\)"$/\1/p' $dir/plugin.toml); do
+                test -f $dir/$entry
+              done
+              test ! -e $dir/tests
+              luau-compile --null $dir/*.luau
+              for f in $dir/translations/*.json; do jq empty $f; done
+              cp -r ${../noctalia-plugin} plugin
+              chmod -R u+w plugin
+              sh plugin/tests/run.sh
+              touch $out
+            '';
+
         clippy = cargoCheck "clippy" [ pkgs.clippy ] "cargo clippy --all-targets --offline -- -D warnings";
         nextest = cargoCheck "nextest" [ pkgs.cargo-nextest ] "cargo nextest run --offline";
 
diff --git a/nix/package.ulu.nix b/nix/package.ulu.nix
index 5f32eed..3dca618 100644
--- a/nix/package.ulu.nix
+++ b/nix/package.ulu.nix
@@ -48,6 +48,10 @@
             ]
           }
           install -Dm644 assets/fonts/LICENSE-DejaVu $out/share/licenses/valw/LICENSE-DejaVu
+          # The Noctalia plugin (programs.valw.noctalia), without its tests.
+          mkdir -p $out/share/valw
+          cp -r noctalia-plugin $out/share/valw/noctalia-plugin
+          rm -r $out/share/valw/noctalia-plugin/tests
         '';
 
         # dlopen()ed at run time: libwayland (winit, valw), libxkbcommon (winit),
diff --git a/noctalia-plugin/README.md b/noctalia-plugin/README.md
new file mode 100644
index 0000000..5a1a142
--- /dev/null
+++ b/noctalia-plugin/README.md
@@ -0,0 +1,16 @@
+# valw for Noctalia
+
+A bar button, the valw toolbar as a Noctalia panel, and a control-center
+tile. Noctalia draws everything, so it follows your Noctalia theme.
+
+- Bar button: left click opens the toolbar, right click takes a region shot.
+- Toolbar: click a mode to capture; the timer and options are remembered
+  (shared with `valw toolbar`).
+- Tile: click for a region shot, right click for the toolbar.
+
+Install it with the home-manager module (`programs.valw.noctalia.enable`),
+then enable `elars/valw` in Noctalia and place the widget (type
+`elars/valw:bar`). Toggle the toolbar from a keybind with
+`noctalia msg panel-toggle elars/valw:toolbar`.
+
+Tests: `nix shell nixpkgs#luau -c sh noctalia-plugin/tests/run.sh`.
diff --git a/noctalia-plugin/bar.luau b/noctalia-plugin/bar.luau
new file mode 100644
index 0000000..52aaefa
--- /dev/null
+++ b/noctalia-plugin/bar.luau
@@ -0,0 +1,36 @@
+--!nonstrict
+-- valw bar widget: a camera glyph. Left click opens the toolbar panel,
+-- right click takes a region shot at once (plain `valw region`, like the
+-- keybind: the toolbar's timer and options don't apply).
+
+local PANEL = "elars/valw:toolbar"
+
+local function lastLine(text)
+  local last = ""
+  for line in string.gmatch(text or "", "[^\n]+") do
+    last = line
+  end
+  return last
+end
+
+-- Exit 3 is a cancel (Esc): not an error.
+local function report(result)
+  if result.exitCode ~= 0 and result.exitCode ~= 3 then
+    noctalia.notifyError("valw", lastLine(result.stderr))
+  end
+end
+
+function update()
+  barWidget.render(ui.row({ align = "center" }, {
+    ui.glyph({ name = "camera" }),
+  }))
+  barWidget.setTooltip(noctalia.tr("bar.tooltip"))
+end
+
+function onClick()
+  noctalia.togglePanel(PANEL)
+end
+
+function onRightClick()
+  noctalia.runAsync("valw region", report)
+end
diff --git a/noctalia-plugin/panel.luau b/noctalia-plugin/panel.luau
new file mode 100644
index 0000000..aacaf13
--- /dev/null
+++ b/noctalia-plugin/panel.luau
@@ -0,0 +1,137 @@
+--!nonstrict
+-- valw toolbar panel: the four modes, the timer and the options, drawn
+-- with Noctalia's own components. The choices live in valw's toolbar.toml:
+-- read with `valw toolbar --state`, changed with `valw toolbar --set`.
+-- A mode click closes the panel, waits for it to go, then captures.
+
+local MODES = {
+  { id = "screen", glyph = "device-desktop" },
+  { id = "region", glyph = "crop" },
+  { id = "window", glyph = "app-window" },
+  { id = "zoom", glyph = "zoom-in" },
+}
+local OPTIONS = { "cursor", "preview", "sound" }
+
+-- The decoded `--state` JSON; nil until it arrives.
+local state = nil
+local unavailable = false
+
+local function lastLine(text)
+  local last = ""
+  for line in string.gmatch(text or "", "[^\n]+") do
+    last = line
+  end
+  return last
+end
+
+-- Exit 3 is a cancel (Esc): not an error.
+local function report(result)
+  if result.exitCode ~= 0 and result.exitCode ~= 3 then
+    noctalia.notifyError("valw", lastLine(result.stderr))
+  end
+end
+
+local render
+
+local function capture(mode)
+  panel.close()
+  noctalia.runAsync("sleep 0.3 && valw toolbar --run " .. mode, report)
+end
+
+-- `key` and `value` are always one of our own tokens, never user text.
+local function remember(key, value)
+  state[key] = value
+  render()
+  noctalia.runAsync("valw toolbar --set " .. key .. "=" .. tostring(value), report)
+end
+
+local function modeButton(m)
+  return ui.button({
+    text = noctalia.tr("mode." .. m.id),
+    glyph = m.glyph,
+    variant = if state.mode == m.id then "primary" else "outline",
+    onClick = function()
+      capture(m.id)
+    end,
+  })
+end
+
+local function optionRow(key)
+  return ui.row({ gap = 8, align = "center", justify = "space_between" }, {
+    ui.label({ text = noctalia.tr("option." .. key), color = "on_surface" }),
+    ui.toggle({
+      checked = state[key],
+      onChange = function(value)
+        remember(key, value == "true")
+      end,
+    }),
+  })
+end
+
+render = function()
+  if unavailable then
+    panel.render(ui.column({ padding = 16 }, {
+      ui.label({ text = noctalia.tr("panel.unavailable"), color = "error" }),
+    }))
+    return
+  end
+  if state == nil then
+    return
+  end
+  local modes = {}
+  for _, m in ipairs(MODES) do
+    table.insert(modes, modeButton(m))
+  end
+  local timers, selected = {}, 0
+  for i, t in ipairs(state.timers) do
+    table.insert(timers, if t == 0 then noctalia.tr("timer.off") else tostring(t) .. " s")
+    if t == state.timer then
+      selected = i - 1
+    end
+  end
+  local rows = {
+    ui.row({ gap = 8, justify = "space_between" }, modes),
+    ui.separator({}),
+    ui.row({ gap = 8, align = "center", justify = "space_between" }, {
+      ui.label({ text = noctalia.tr("timer.label"), color = "on_surface" }),
+      ui.select({
+        options = timers,
+        selectedIndex = selected,
+        onChange = function(index)
+          remember("timer", state.timers[tonumber(index) + 1])
+        end,
+      }),
+    }),
+  }
+  for _, key in ipairs(OPTIONS) do
+    table.insert(rows, optionRow(key))
+  end
+  panel.render(ui.column({ gap = 12, padding = 16 }, rows))
+end
+
+local function fail(message)
+  unavailable = true
+  noctalia.notifyError("valw", message)
+  render()
+end
+
+function onOpen(_context)
+  unavailable = false
+  if not noctalia.commandExists("valw") then
+    fail(noctalia.tr("panel.unavailable"))
+    return
+  end
+  noctalia.runAsync("valw toolbar --state", function(result)
+    if result.exitCode ~= 0 then
+      fail(lastLine(result.stderr))
+      return
+    end
+    local decoded = noctalia.json.decode(result.stdout)
+    if type(decoded) ~= "table" then
+      fail(noctalia.tr("panel.unavailable"))
+      return
+    end
+    state = decoded
+    render()
+  end)
+end
diff --git a/noctalia-plugin/plugin.toml b/noctalia-plugin/plugin.toml
new file mode 100644
index 0000000..6f7fd39
--- /dev/null
+++ b/noctalia-plugin/plugin.toml
@@ -0,0 +1,34 @@
+# valw for Noctalia: a bar button, the toolbar as a Noctalia panel and a
+# control-center tile. Thin clients of the valw CLI: the choices live in
+# valw's own toolbar.toml (`valw toolbar --state` / `--set`), captures run
+# through `valw toolbar --run` and `valw region`.
+
+id = "elars/valw"
+name = "valw"
+version = "0.1.0"
+plugin_api = 3
+author = "elars"
+license = "MIT"
+dependencies = ["valw"]
+tags = ["screenshot", "capture"]
+icon = "camera"
+description = "macOS-style screenshots with valw: a bar button, a toolbar panel and a control-center tile."
+
+# Left click: the toolbar panel. Right click: a region shot.
+[[widget]]
+id = "bar"
+entry = "bar.luau"
+
+[[panel]]
+id = "toolbar"
+entry = "panel.luau"
+width = 360
+height = 220
+placement = "attached"
+position = "auto"
+open_near_click = true
+
+# Click: a region shot. Right click: the toolbar panel.
+[[shortcut]]
+id = "tile"
+entry = "shortcut.luau"
diff --git a/noctalia-plugin/shortcut.luau b/noctalia-plugin/shortcut.luau
new file mode 100644
index 0000000..f74e3e0
--- /dev/null
+++ b/noctalia-plugin/shortcut.luau
@@ -0,0 +1,31 @@
+--!nonstrict
+-- valw control-center tile. Click: the control center closes, then a
+-- region shot (so it isn't in it). Right click: the toolbar panel.
+
+local PANEL = "elars/valw:toolbar"
+
+local function lastLine(text)
+  local last = ""
+  for line in string.gmatch(text or "", "[^\n]+") do
+    last = line
+  end
+  return last
+end
+
+-- Exit 3 is a cancel (Esc): not an error.
+local function report(result)
+  if result.exitCode ~= 0 and result.exitCode ~= 3 then
+    noctalia.notifyError("valw", lastLine(result.stderr))
+  end
+end
+
+shortcut.setLabel(noctalia.tr("tile.label"))
+shortcut.setIcon("camera", "camera")
+
+function onClick()
+  noctalia.runAsync("noctalia msg panel-close; sleep 0.3 && valw region", report)
+end
+
+function onRightClick()
+  noctalia.togglePanel(PANEL)
+end
diff --git a/noctalia-plugin/tests/bar_test.luau b/noctalia-plugin/tests/bar_test.luau
new file mode 100644
index 0000000..0e94350
--- /dev/null
+++ b/noctalia-plugin/tests/bar_test.luau
@@ -0,0 +1,24 @@
+--!nonstrict
+-- The bar widget. Runs after stubs.luau and bar.luau.
+
+update()
+assert(findAll(rendered, function(n) return n.kind == "glyph" and n.props.name == "camera" end)[1], "camera glyph")
+ok("renders")
+
+onClick()
+assert(calls.toggled[1] == "elars/valw:toolbar", "left click toggles the panel")
+assert(#calls.run == 0)
+ok("left click")
+
+reset()
+onRightClick()
+assert(calls.run[1] == "valw region", calls.run[1])
+reset()
+fake.answers["valw region"] = { exitCode = 1, stdout = "", stderr = "error: busy\n" }
+onRightClick()
+assert(calls.notify[1][2] == "error: busy", "failure notified")
+reset()
+fake.answers["valw region"] = { exitCode = 3, stdout = "", stderr = "" }
+onRightClick()
+assert(#calls.notify == 0, "cancel is silent")
+ok("right click")
diff --git a/noctalia-plugin/tests/panel_test.luau b/noctalia-plugin/tests/panel_test.luau
new file mode 100644
index 0000000..a607fd2
--- /dev/null
+++ b/noctalia-plugin/tests/panel_test.luau
@@ -0,0 +1,87 @@
+--!nonstrict
+-- The toolbar panel. Runs after stubs.luau and panel.luau.
+
+local STATE = { mode = "zoom", timer = 5, cursor = false, preview = true, sound = true, timers = { 0, 5, 10 } }
+
+-- valw missing from Noctalia's PATH: a label and a notification, no panel.
+fake.exists = false
+onOpen(nil)
+local labels = findAll(rendered, function(n) return n.kind == "label" end)
+assert(#labels == 1 and labels[1].props.text == "panel.unavailable", "unavailable label")
+assert(#calls.notify == 1, "notified once")
+assert(#calls.run == 0, "nothing run")
+ok("valw missing")
+
+-- --state failing: the same.
+reset()
+fake.exists = true
+fake.answers["valw toolbar --state"] = { exitCode = 1, stdout = "", stderr = "warn\nerror: broken\n" }
+onOpen(nil)
+assert(findAll(rendered, function(n) return n.kind == "label" and n.props.text == "panel.unavailable" end)[1], "label")
+assert(calls.notify[1][2] == "error: broken", "the stderr's last line: " .. tostring(calls.notify[1][2]))
+ok("--state failing")
+
+-- A working valw: the remembered mode is primary, the timer selected.
+reset()
+fake.answers["valw toolbar --state"] = { exitCode = 0, stdout = "{}", stderr = "" }
+fake.decoded = STATE
+onOpen(nil)
+assert(calls.run[1] == "valw toolbar --state", calls.run[1])
+assert(button("mode.zoom").props.variant == "primary", "zoom is primary")
+for _, m in ipairs({ "mode.screen", "mode.region", "mode.window" }) do
+  assert(button(m).props.variant == "outline", m .. " is outline")
+end
+local select = findAll(rendered, function(n) return n.kind == "select" end)[1]
+assert(select.props.selectedIndex == 1, "5 s is index 1 (0-based)")
+assert(select.props.options[1] == "timer.off" and select.props.options[2] == "5 s", "timer labels")
+local toggles = findAll(rendered, function(n) return n.kind == "toggle" end)
+assert(#toggles == 3, "three toggles")
+assert(toggles[1].props.checked == false and toggles[2].props.checked == true, "cursor off, preview on")
+local hex = findAll(rendered, function(n)
+  for _, v in pairs(n.props) do
+    if type(v) == "string" and string.find(v, "^#") then return true end
+  end
+  return false
+end)
+assert(#hex == 0, "no hex colours")
+ok("renders the state")
+
+-- A mode click closes the panel first, then captures after the wait.
+reset()
+button("mode.region").props.onClick()
+assert(calls.order[1] == "close" and calls.order[2] == "run", "close, then run")
+assert(calls.run[1] == "sleep 0.3 && valw toolbar --run region", calls.run[1])
+assert(#calls.notify == 0, "success is silent")
+ok("mode click")
+
+-- A failed capture notifies; a cancelled one doesn't.
+reset()
+fake.answers["sleep 0.3 && valw toolbar --run"] = { exitCode = 1, stdout = "", stderr = "error: no outputs\n" }
+button("mode.screen").props.onClick()
+assert(calls.notify[1][2] == "error: no outputs", "failure notified")
+reset()
+fake.answers["sleep 0.3 && valw toolbar --run"] = { exitCode = 3, stdout = "", stderr = "" }
+button("mode.window").props.onClick()
+assert(#calls.notify == 0, "cancel is silent")
+ok("capture results")
+
+-- The timer and the toggles write through --set and re-render at once.
+reset()
+fake.answers["sleep 0.3 && valw toolbar --run"] = nil
+select = findAll(rendered, function(n) return n.kind == "select" end)[1]
+select.props.onChange("2")
+assert(calls.run[1] == "valw toolbar --set timer=10", calls.run[1])
+select = findAll(rendered, function(n) return n.kind == "select" end)[1]
+assert(select.props.selectedIndex == 2, "re-rendered with 10 s")
+reset()
+toggles = findAll(rendered, function(n) return n.kind == "toggle" end)
+toggles[3].props.onChange("false")
+assert(calls.run[1] == "valw toolbar --set sound=false", calls.run[1])
+toggles = findAll(rendered, function(n) return n.kind == "toggle" end)
+assert(toggles[3].props.checked == false, "re-rendered with sound off")
+reset()
+fake.answers["valw toolbar --set"] = { exitCode = 1, stdout = "", stderr = "error: read-only\n" }
+toggles[1].props.onChange("true")
+assert(calls.run[1] == "valw toolbar --set cursor=true", calls.run[1])
+assert(calls.notify[1][2] == "error: read-only", "a failed --set notifies")
+ok("timer and toggles")
diff --git a/noctalia-plugin/tests/run.sh b/noctalia-plugin/tests/run.sh
new file mode 100644
index 0000000..a466e09
--- /dev/null
+++ b/noctalia-plugin/tests/run.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+# Runs each plugin test as one chunk: the stubs, the entry script, the test.
+# Needs `luau` (nix shell nixpkgs#luau -c sh noctalia-plugin/tests/run.sh).
+set -eu
+dir=$(dirname "$0")
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT
+for pair in panel:panel_test bar:bar_test shortcut:shortcut_test; do
+  entry=${pair%%:*}
+  test=${pair##*:}
+  cat "$dir/stubs.luau" "$dir/../$entry.luau" "$dir/$test.luau" > "$tmp/$test.luau"
+  luau "$tmp/$test.luau"
+done
diff --git a/noctalia-plugin/tests/shortcut_test.luau b/noctalia-plugin/tests/shortcut_test.luau
new file mode 100644
index 0000000..1abd267
--- /dev/null
+++ b/noctalia-plugin/tests/shortcut_test.luau
@@ -0,0 +1,19 @@
+--!nonstrict
+-- The control-center tile. Runs after stubs.luau and shortcut.luau.
+
+onClick()
+assert(calls.run[1] == "noctalia msg panel-close; sleep 0.3 && valw region", calls.run[1])
+reset()
+fake.answers["noctalia msg panel-close"] = { exitCode = 1, stdout = "", stderr = "error: busy\n" }
+onClick()
+assert(calls.notify[1][2] == "error: busy", "failure notified")
+reset()
+fake.answers["noctalia msg panel-close"] = { exitCode = 3, stdout = "", stderr = "" }
+onClick()
+assert(#calls.notify == 0, "cancel is silent")
+ok("click")
+
+reset()
+onRightClick()
+assert(calls.toggled[1] == "elars/valw:toolbar", "right click toggles the panel")
+ok("right click")
diff --git a/noctalia-plugin/tests/stubs.luau b/noctalia-plugin/tests/stubs.luau
new file mode 100644
index 0000000..331b073
--- /dev/null
+++ b/noctalia-plugin/tests/stubs.luau
@@ -0,0 +1,85 @@
+--!nonstrict
+-- Stand-ins for Noctalia's globals. Each test is run as one chunk:
+-- these stubs, then the entry script, then the test (see run.sh).
+
+calls = { run = {}, notify = {}, toggled = {}, closed = 0, order = {} }
+fake = {
+  exists = true,
+  -- runAsync answers by command prefix: { exitCode, stdout, stderr }
+  answers = {},
+  decoded = nil,
+}
+rendered = nil
+
+local function node(kind)
+  return function(props, children)
+    return { kind = kind, props = props or {}, children = children or {} }
+  end
+end
+
+ui = {
+  row = node("row"), column = node("column"), label = node("label"),
+  button = node("button"), glyph = node("glyph"), toggle = node("toggle"),
+  select = node("select"), separator = node("separator"), spacer = node("spacer"),
+}
+
+noctalia = {
+  tr = function(key) return key end,
+  commandExists = function(_name) return fake.exists end,
+  runAsync = function(command, callback)
+    table.insert(calls.run, command)
+    table.insert(calls.order, "run")
+    if callback then
+      local answer = { exitCode = 0, stdout = "", stderr = "" }
+      for prefix, a in pairs(fake.answers) do
+        if string.sub(command, 1, #prefix) == prefix then answer = a end
+      end
+      callback(answer)
+    end
+    return true
+  end,
+  notifyError = function(title, body) table.insert(calls.notify, { title, body }) end,
+  togglePanel = function(id) table.insert(calls.toggled, id) end,
+  json = { decode = function(_text) return fake.decoded end },
+}
+
+panel = {
+  render = function(tree) rendered = tree end,
+  close = function()
+    calls.closed += 1
+    table.insert(calls.order, "close")
+  end,
+}
+
+barWidget = {
+  render = function(tree) rendered = tree end,
+  setTooltip = function(_text) end,
+}
+
+shortcut = {
+  setLabel = function(_text) end,
+  setIcon = function(_a, _b) end,
+}
+
+-- Every node of `tree` that `match` accepts, depth first.
+function findAll(tree, match, out)
+  out = out or {}
+  if type(tree) ~= "table" then return out end
+  if tree.kind and match(tree) then table.insert(out, tree) end
+  for _, child in ipairs(tree.children or {}) do findAll(child, match, out) end
+  return out
+end
+
+function button(text)
+  local found = findAll(rendered, function(n) return n.kind == "button" and n.props.text == text end)
+  assert(#found == 1, "one button " .. text .. ", found " .. #found)
+  return found[1]
+end
+
+function reset()
+  calls = { run = {}, notify = {}, toggled = {}, closed = 0, order = {} }
+end
+
+function ok(name)
+  print("ok - " .. name)
+end
diff --git a/noctalia-plugin/translations/en.json b/noctalia-plugin/translations/en.json
new file mode 100644
index 0000000..6a25c9f
--- /dev/null
+++ b/noctalia-plugin/translations/en.json
@@ -0,0 +1,8 @@
+{
+  "bar": { "tooltip": "Screenshot" },
+  "tile": { "label": "Screenshot" },
+  "panel": { "unavailable": "valw is not available" },
+  "mode": { "screen": "Screen", "region": "Region", "window": "Window", "zoom": "Zoom" },
+  "timer": { "label": "Timer", "off": "Off" },
+  "option": { "cursor": "Show cursor", "preview": "Show preview", "sound": "Play sound" }
+}
diff --git a/noctalia-plugin/translations/tr.json b/noctalia-plugin/translations/tr.json
new file mode 100644
index 0000000..1c493e0
--- /dev/null
+++ b/noctalia-plugin/translations/tr.json
@@ -0,0 +1,8 @@
+{
+  "bar": { "tooltip": "Ekran görüntüsü" },
+  "tile": { "label": "Ekran görüntüsü" },
+  "panel": { "unavailable": "valw bulunamadı" },
+  "mode": { "screen": "Ekran", "region": "Bölge", "window": "Pencere", "zoom": "Yakınlaştır" },
+  "timer": { "label": "Zamanlayıcı", "off": "Kapalı" },
+  "option": { "cursor": "İmleci göster", "preview": "Önizlemeyi göster", "sound": "Ses çal" }
+}